Plant tomatoes at 18- to 24-inch spacing so the roots have enough room to spread out. Rows of tomato plants should be spaced at least 3 feet apart. In a 4'x4' raised bed, you can plant one plant in each corner, providing plenty of space for your plants to grow.
Let me explain: tomatoes take up a TON of room, and are super-heavy feeders. Minimum spacing for most tomatoes is 18 inches; 24 is better. So you'll have room in your 4x4 bed for four plants, set 24 inches apart and 12 inches from the support timbers.
A 4ft. x 4ft. raised garden bed gives you 16 square feet of growing space (more if you add some trellises for vertical space). That means you can grow around 10 to 11 indeterminate, or vining, tomato plants in one raised bed—if you really love cherry tomatoes, that is.
They recommend spacing tomato plants two feet or more apart. Air circulation is particularly important considering that disease spread quickly in humid situations, according to researchers from the UC Davis Vegetable Research and Information Center.
1: Artichoke
Due to similar climate conditions, artichokes work well as perennials in northern California, but may be difficult to grow as perennials in other areas of the nation. Since artichokes like moderate conditions, grow them as annuals in cold winter and hot summer areas.
Tomato plants require a good amount of these resources, so if they're planted closely together, they will compete and likely all lose. Low Production – Even if tomato plants growing closely together survive, they may not produce as many tomatoes as they could have if properly spaced.
If using cages or another wide support system, you can probably fit 6-8 tomato plants in that bed. If you're using a drop-string trellis or using determinate tomato varieties, you can probably fit 10-12 tomato plants in that bed.
Water correctly: Do not overwater. The first week tomato plants are in the ground, they need water every day, but back off watering after the first week, slowly weaning the plants down to 1 to 1.5 inches of water per week.
You can grow up to 32 different plants inside your 4' x 8' raised garden bed using “Square Foot Gardening” techniques. There are countless books and online resources available to guide you in this rewarding method of gardening.
Tomatoes should ideally be grown in a raised bed that's at least 15 to 18 inches deep.
If you're planning a 12-inch deep raised bed, you'll need approximately 24 cubic feet of soil to fill a 4x8 bed. A depth of 18 inches will require approximately 36 cubic feet of soil. The type of soil you use will also affect the volume required to fill your raised bed.
If your soil doesn't drain well, you might be better off growing your tomatoes in raised beds. Like most vegetables, tomatoes like well-draining, nitrogen-rich soil with a pH of around 6.5.
You can also sub Alfalfa Meal if you can't find Fish Meal or a fish head. The next thing that goes into the hole are a couple of aspirin tablets and some crushed chicken egg shells. The aspirin is to help jump start the plant's immune system. We'll put three or four crushed egg shells into the hole as well.
In beds or rows, the best spacing for most pepper plants is 18 to 24 inches apart (check the tag for exceptions). Peppers grow best in a soil with a pH between 6.2 and 7.0, although they can tolerate slightly alkaline conditions near 7.5.
That means a conservative estimate for the total number of tomatoes harvested during the season would be over 400 tomatoes, or roughly 100 tomatoes per plant. If you grow tomatoes the way I do, it's safe to bet on getting at least 100 tomatoes off your plants within four to five weeks during your peak season.
Robust and small-growing, determinate tomato varieties are much better for a raised bed. Hardy wild tomatoes that grow thick and bushy are also a great choice. Tip: If you place your tomato plants at the edge of your raised bed, they will hang over and take up less space than they otherwise would.
Tomatoes are vigorous growers that need lots of room for roots to spread out. Containers should be at least 5 gallons or 12 inches wide and deep, though bigger is better.
Generally speaking, the ideal spacing for tomato plants is between 24 and 36 inches (61-91 cm.) apart. Spacing tomato plants any closer than 24 inches (61 cm.) will reduce air circulation around the plants and may result in disease.
If the healthy plants are too close together, the leaves will touch each other and disease can easily spread from one plant to another. The plants will compete for resources in case they are planted too close together, Therefore the tomatoes will be smaller and less flavorful.
Why You Should Prune Tomato Plants. Pruning indeterminate tomato plants helps direct the plant's energy towards producing fruit rather than producing more foliage. Removing suckers and yellowed leaves also encourages larger fruit, better airflow, fewer diseases, and for container-grown tomatoes, better size.
Make sure to leave 2 to 3 feet in between the raised garden beds, and then add a walkway around the perimeter of the garden so that you can tend your plants from all sides. I recommend doing one to three obelisk trellises in each raised bed, depending on the length of your raised beds.
In that size bed I would put 6 plants and stagger them so as to put as much space between them without getting too close to the sides. Feldon plants 1 foot from the side which should be good. As Worth said, fill those beds up and next time use wider boards to afford more depth.
Root vegetables—radishes, carrots, turnips, onions, shallots, garlic—grow best in loose, partially sandy soil, which makes them ideal candidates for raised beds, where the soil is usually much less compacted in the absence of foot traffic.